预制混凝土夹心保温外墙板拉结件系统火灾后性能研究  

Performance study on connector system of precast concrete sandwich wall after fire

作　　者：张国来 赵毅 田东[3] 周剑 王聪颖 卢晓岩[1] 任烨[3] 刘畅[3] ZHANG Guolai;ZHAO Yi;TIAN Dong;ZHOU Jian;WANG Congying;LU Xiaoyan;REN Ye;LIU Chang(Beijing Urban Construction Real Estate Development Co.,Ltd.,Beijing 100032,China;China Academy of Building Research Co.,Ltd.,Beijing 100013,China;Beijing Institute of Archetectural Design,Beijing 100045,China)

机构地区：[1]北京城建房地产开发有限公司,北京100032 [2]中国建筑科学研究院有限公司,北京100013 [3]北京市建筑设计研究院有限公司,北京100045

出　　处：《混凝土与水泥制品》2023年第12期73-78,共6页China Concrete and Cement Products

摘　　要：为研究预制混凝土夹心保温外墙板中不锈钢拉结件系统在火灾后的抗剪性能,以某实体项目拆除墙板为研究对象,通过3 h内叶板和1 h外叶板的耐火试验模拟火灾的影响,分别进行了耐火试验前后非破坏性力学试验和耐火试验后破坏性力学试验,并与板式拉结件标准剪切试件进行了对比。结果表明:受极端火灾影响后,不锈钢拉结件系统抗剪承载力明显降低,但仍可达到拉结件设计对应的承载力试验值的1.6倍;不锈钢拉结件系统抗剪刚度明显降低,但在自重荷载标准值作用下位移约1.0 mm,低于北京市地方标准规定的限值2.5 mm;大位移时的破坏模式仍为拉结件受压侧失稳与受拉侧混凝土锚固破坏,且荷载下降不超过峰值荷载的15%。In order to study the shear performance of the stainless steel connector system on precast concrete sandwich insulation exterior wall panel after fire,taking the demolition wall panel of a physical project as the research object,the fire impact was simulated through the fire resistance test of 3 h inner leaf plate and 1 h outer leaf,and the non-destructive comparative mechanical test before and after fire resistance test and destructive mechanical test after fire resistance test were carried out and compared to the standard shear specimen.The results show that after being affected by extreme fire,the shear bearing capacity of the stainless steel connector system is significantly reduced,but it can still reach 1.6 times the corresponding bearing capacity test value of the tension joint design.The shear stiffness of the stainless steel tie joint system is significantly reduced,but the displacement is about 1.0 mm under the action of the self-weight load standard value,which is lower than the limit value 2.5 mm stipulated by the local standard of Beijing.The failure mode at large displacement is still the buckling of the compression side of the tie joint and the anchorage failure of the concrete on the tensile side,and the load drop does not exceed 15%of the peak load.

关 键 词：预制混凝土夹心保温墙 火灾 不锈钢拉结件 抗剪性能 

分 类 号：TU352.59[建筑科学—结构工程]